In what lighting environment does a person live in the house living space? When the person applies the artificial lighting feeling that it is dark only by daylighting, how are behaviors and the lighting environment related? In this research, the lighting environments in August and November were measured to discuss them, and the residents evaluated them. As a result, the following results were obtained. It has been understood that the lighting environment changes greatly by the season in living space into which the direct light enters. At the average illuminance when the artificial lighting is needed, November is an obviously low level than August. Persons keep behaviors after it is felt that it is a little dark in November. It is thought that the standard of the brightness when the artificial lighting is needed is different in August and November.
